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- W2061838232 abstract "The Mn4+-abundant surface of the Li- and Al-substituted spinel cathode materials is found to provide electrochemical and interfacial stabilities in the voltage region of 3.3–4.3 V vs. Li/Li+ in the room temperature electrolyte of 1M LiPF6/EC:DEC. Surface characterization using ex situ X-ray photoelectron spectroscopy reveals that surface Mn4+-abundance induces the formation of aplenty of new surface components and the passivation of cathode surface before being reduced to Mn3+ to Mn2+, leading to capacity retention 90% with discharge capacities 102–90 mAh/g over 50 cycles. FTIR spectroscopic analysis results and scanning electron microscopic imaging ensure that the Mn4+-abundant surface is better passivated by solid electrolyte interphase (SEI) layer that is composed of mixed organic and inorganic compounds, resulting in somewhat preserved particle morphology. On the contrary, the cathodes with equal amounted surface Mn4+/Mn3+ and Mn3+-abundant surface are readily subjected to severe interfacial reaction and particle morphology change accompanied by inferior surface coverage by surface species, which are responsible for a rapid capacity fade. The data contribute to a basic understanding of importance of surface control and its impact on the cycling performance of spinel-based cathode materials for lithium-ion batteries." @default.
- W2061838232 created "2016-06-24" @default.
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- W2061838232 date "2011-01-01" @default.
- W2061838232 modified "2023-10-12" @default.
- W2061838232 title "Impacts of Surface Mn Valence on Cycling Performance and Surface Chemistry of Li- and Al-Substituted Spinel Battery Cathodes" @default.
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- W2061838232 doi "https://doi.org/10.1149/1.3556638" @default.
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